Maybe the new law suit filed by Apple last week. Maybe the pending laws suits filed by Apple a few months ago. Maybe problems getting Honeycomb working with their HTC Sense overlay, or working with HTC Scribe technology. Whatever the problem is, since they have gone totally dark, I am inclined to believe that even HTC doesn't know when the release is going to be. That could mean it is going to be a while.
I was anxiously waiting too. When I first saw iPad about 18 months ago, I said "if it had a pen that I could use to replace this tablet of paper I carry everywhere, then I would buy one in an instant.". HTC flyer seems to have just enough pen functionality that I could "get by" - not perfect but good enough - but the screen is just too small for my big scrawling script. Even 10" is a bit small, but I could "get by".